Talking about the insides of M3s I have this interior shot of Sgt Lattimore's Stuart 2017. 
 
There is a filter of some sort right up against the main battery switch box.  
 
From other info that switch was a knife switch that was supposed to be turned on and off.  
 
never seen such a filter/whatever fitted before and have no idea what its for. 
 
The engine compartment shot doesn't quite show if it lines up with a hole in the wall of the fighting compartment. The filter look original 1942 . 
 
anyone have any clues??
		 
		
		
		
			
		
		
		
		
		
		
		
		
	
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